Enjoy the following apps that are free to you and your students:

iTunes U:

http://www.apple.com/support/itunes-u/

Instructors can create individualized course content for students to access with iPad, iPod touch, or iPhone.
Excerpt from the iTunes U website:
The iTunes U app integrates with iBooks, iCloud, and other apps to make it easy for students to keep up with your course. For example, new iBooks textbooks2 and other books for the course are available right from the app, where students can tap them to start reading the assigned chapter. Notes taken in iBooks are consolidated for easy reviewing in the iTunes U app. If an assignment includes watching part of a video, one tap goes straight to a specific spot in the video. And iTunes U keeps documents, notes, highlights, and bookmarks up to date across multiple devices.



http://www.apple.com/ilife/garageband/
GARAGE BAND
Students can use the Garage Band software to create music or podcasts. Students can input photographs, videoclips, music (both imported from the internet or chosen from the pre-selected catalog) to enhance their voice overs.
For example:) In my Italian class, we were focusing on sports. Students chose a real or created an imaginary sports competition and had to create a newscast on it using the grammatical structure we were working on. Here is an example of the audio clip produced by 3 of my students. For some reason, the wiki wouldn't allow me to input the media they included.